Improvement in sash-balances



B. E. HARTMAN.

Sash-Balances.

` Patentedjan. 28,1873.V

AM. P/loro-umosRAPH/c ca Mdommve Pnocsss) 'UNITED STATES PATENT OFFICE.

BENJAMIN E. EARTMAN, 0E PICKERING Posr, oHARLEsrowN VILLAGE,PENNSYLVANIA.

IMPROVEMENT IN SASH-BALANCES.

Specification forming part of Letters Patent No. 135,221, dated January2S, 1873.

To all whom it may-concern Y Be it known that I, BENJ. F. HARTMAN, ofPickering Post, in the county of Chester and State of Pennsylvania, haveinvented certain new and useful Improvements in Self- Balanced Sash; anddo hereby declare that the following is a full, clear, and exactdescription thereof, reference being had to the accompanying drawingmaking a part of this specilication, in which- Figure 1 is an elevationof the inner side of a window with the sash balanced by my improvedapparatus. Fig. 2 is a vertical section of the same on linew a: ofFig. 1. Fig. 3 is an enlarged front elevation of the device employed forshortening or lengthening the balancing tape or cord. Fig. 4 is ahorizontal central section of the same as applied to a sash. Fig.`5 is avertical section of a tapepulley employed within an upper corner-of thewindow-frame, and Fig. 6 is an elevation of the outer side of saidpulley and of the metal washer used for a bearing beneath thc same.

Letters of like name and kind refer to like parts in each ofthe figures.

My invention is an improvement upon a class of vdevices employed forenabling one sash of a window to cunterbalanoe the other sash; and itconsists in the peculiar construction of the device used for shorteningor lengtheningthe balancing cord or tape, substantially as and for thepurpose hereinafter specified.

In the annexed drawing, A andA represent thejambs, B the head, andO thesill of an ordinary window-frame, containing two sash, D and E, all ofusual construction. Secured upon or within the inner face of thewindowframe, at the transverse center and upper end of each jamb A, is ametal plate, F, (having the form shown in Fig. 6,) through the lowerenlarged portion of which passes a screw, G, that serves as a pivotalbearing for and upon which revolves a grooved pulley, H. A cord or tape,I, attached to the upper end and outer side of the side rails of eachsash, and passing over the pulleys H, causes the weight of one sash tobalance the weight of the other sash, so that as one of said sash israised the other will be lowered, and both will maintain their relativepositions, unless purposely @hanged Y As thus arranged, it will be seenthat it is impracticable to move one sash without chan gcorrespondingrecess cut in the inner face of the lower rail of the lower sash is ametal box or casing, K, within which is journaled a drum or spool, L,the axis of which is in a horizontal line and at a right angle to theline of said rail. Upon the projecting endl of the spool-shaft is fittedone end of a bar, M, the inner face of which is provided with a recessthat, while closely embracing the sides of said shaft in one direction,is elongated in a line with said bar. A pin, m, passing throughthe bar Mand the shaft l connects said parts loosely together, and acts as apivotal bearing upon which said bar oscillates as its outer end is movedtoward or from the sash. The outer end of the bar M is provided with aknob or stud, N, by means of which the former and the spool are rotatedupon or around the shaft l, while upon the inner side of said bar isprovided an angular tooth or projection, m', that engages with acircular toothed rack, 0, which is secured upon the face and forms partof the casing K. A spring, e, secured upon the shaft l, and bearing uponor against the short end of the bar M, presses the same outward andholds the tooth m in engagement with the rack, so as to prevent motionof the spool in one direction, except when said tooth is purposelywithdrawn from contact with said rack by pulling outward upon the knobN. Each of the cords or tapes I is now extended downward to the lowercorners of the bottom sash, inward, and slightly upward around asuitable pulley, P, inserted within said sash, and has its end securedto or upon the spool L, so as to cause it to be wound thereon wheneversaid spool is revolved in the right direction. A circular metal disk,l', secured upon and forming a part ofthe spool, divides longitudinallyits periphery and prevents the cords or tapes from interfering with eachother.

As thus arranged it will be seen that by turning the spool so as to windthereonthe cords or tapes the 'lower sash will be raised, after which,by reversing the motion of said spool, said sash will be lowered toplace without in any manner interfering with the position of the uppersash, and that by providing a sufficient length of cords, said uppersash can in like manner be lowered or raised independent of said lowersash. Y

It is intended that metal cord or tape shall be employed for connectingthe sash7 in which event the pulleys l? may be omitted and glass guidesQ, having the form shown in Fig. 17 substituted therefor.

Having thus fully set forth the nature and merits of my invention, whatI claim as new 1s- The means employed for adjusting the available lengthofthe connecting cords or tapes, consisting of the casing vKV providedwith the toothed rack O, the spool L secured upon the shaft l andprovided with the partition-disk l', the loosely-pivoted bar M providedwith the tooth or projection fm,' and knob N, and the spring z, whensaid parts are constructed and combined substantially as specified. Y

In testimony that I claim the foregoing I have hereunto set my hand this11th day of February, 1871. BENJ N FRANKN HARTMAN. Witnesses:

FREDERIC LAMBERT, LEWIS RAPP.

